Hardware Comparisons

Brilliant little benchmark comparison tool at http://www.tomshardware.com/ for comparing performance of different GPU boards http://www23.tomshardware.com/graphics.html

Case cooling

Fantastic article with technical illustration on what a decent case cooling solution and airflow design should be like at Silentpcreview.

Computer labs how to drive imaging disk cloning

Its amazing the amount of things you need to know to be able to set up a computer lab with go-back functionality. There are quite a bit of articles on this although it took me some time to find it.

searched on how to set up a computer lab in google and that helped a lot.

The best site of the lot was
http://www.techsoup.org

I think for drive or disk imaging Acronis is the best choice.
http://www.acronis.com